especially if you're carrying your baby on your back? Both me and dd (5 months) love going out with the sling and I don't find her heavy but once you have all the usual stuff to carry (nappies, spare clothes, purse, keys, water, snack for ds etc etc..) it's not that great and means you're a bit stuck if you want to buy anything at the shops while you're out, go to the library etc. because you end up looking (and feeling)like a pack horse! If I go into town I usually take the buggy as well which seems to defeat the purpose a bit!! I'm quite fancying a sling that can do back carries as well but then I couldn't wear a rucksack for the stuff. What do other people do?
I have an onbag, which is basically a long strapped bag but with 2 straps so you can tie it on/around you. I normally wear it as a rucksack but under DD's bum, or a messenger bag style on one side if I will be ina nd out of it.
Any long strapped bag is fine but better if it has fabric straps rather than webbing as then it won't cut into legs/leave marks on head when they fall asleep on strap